Thursday, March4, 2021
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Marine Weather and Tides
Brookmont, MD

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:34AMSunset 6:05PM Thursday March 4, 2021 11:26 PM EST (04:26 UTC) Moonrise 12:00AMMoonset 9:52AM Illumination 61% Phase: Waning Gibbous; Moon at 21 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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ANZ535 Tidal Potomac From Key Bridge To Indian Head- 938 Pm Est Thu Mar 4 2021
.small craft advisory in effect through Friday afternoon...
Rest of tonight..NW winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft.
Fri..NW winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft.
Fri night..NW winds 10 kt with gusts to 20 kt. Waves 1 ft.
Sat..NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Sat night..NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Sun..NW winds 5 to 10 kt. Waves 1 ft.
Sun night..N winds 5 kt. Waves less than 1 ft.
Mon..SW winds 5 kt. Waves less than 1 ft.
Tue..SW winds 5 kt. Waves less than 1 ft.
ANZ500 938 Pm Est Thu Mar 4 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will continue to push south of the waters as canadian high pressure builds toward the region through Saturday. The high will settle overhead Saturday night into Sunday before shifting offshore early next week. Small craft advisories will likely be required Friday night through Saturday, and possibly Saturday night.


7 Day Forecast for Marine Location Near Brookmont, MD
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location: 38.92, -77.1     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 050245 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 945 PM EST Thu Mar 4 2021

SYNOPSIS. Strong Canadian high pressure over the Great Lakes will slowly build toward the region through the weekend before shifting into the Southeast early next week, before migrating offshore toward the middle of the work week.

NEAR TERM /TONIGHT/. Large Canadian high pressure building over the northern Great Lakes is responsible for the gusty northwest winds this evening as the Mid-Atlantic region resides in the wake of a cold front marching southward into the Southeastern states. Satellite imagery and surface observations highlight these gusty northwest winds advecting in a much drier airmass, and allowing earlier clouds to diminish outside the higher elevations of the Allegheny Mountains. The gusty winds will persist through the overnight hours as a much colder and drier airmass takes the reigns. Even with the elevated winds, temperatures are expected to dip into the teens and 20s for the entire CWA, likely holding closer to 30 degrees in the city centers. Wind chills by daybreak Friday will hover below zero across the higher elevations, with single digits and teens elsewhere.

SHORT TERM /FRIDAY THROUGH SUNDAY/. A large H5 low over eastern Canada will continue to retrograde inducing a large upper level trough that extends down to the southeast CONUS. Meanwhile upper level ridging persists over the Midwest which will result in a large surface high pressure residing over the Great Lakes region. Influence from the high will continue the dry weather trend into early next week as the gradient between the high and low induce gusty NW winds that are expected to continue through Saturday. Thereafter, the low will exit off into the North Atlantic, allowing the high to slowly slide southeast over the CWA which will allow the winds to diminish Sunday into Monday.

Temperatures will remain just below normal for this time of year through the weekend with cold overnight lows in the 20s and daytime highs in the 40s for most with low 30s across the mountains.

LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/. Mainly dry weather is likely to continue Sunday through Wednesday with a notable warming trend Tuesday into Wednesday.

An upper-level trough that will be overhead on Sunday will move offshore by Monday afternoon as a region of surface high pressure builds locally. The surface high will slowly move offshore Tuesday into Wednesday allowing for return flow. This coupled with an upper- level ridge building over the Plains propagating eastward will allow for temperatures to soar into the 60s with 70 degrees possible in some of the warmer locales Tuesday into Wednesday.

It is possible we get through the entire long term period without any measurable precipitation. The next opportunity for precipitation arrives with a cold front Wednesday night into Thursday. Guidance varies regarding how much moisture if any will be associated with this feature.

AVIATION /03Z FRIDAY THROUGH TUESDAY/. Large high pressure building into the Great Lakes will continue to deliver northwest wind gusts to around 25 knots through the overnight hours as VFR conditions prevail. Gusty northwest winds, dry conditions, and VFR VIS/CIGs are expected to persist through Saturday as the high slowly nudges closer to the region.

Winds will begin to diminish Saturday night as high pressure becomes more centralized over the region. VFR conditions are likely Sunday into early next week as high pressure builds nearby.

MARINE. SCA in effect for all waters tonight as the gradient remains tight with large Canadian high pressure building into the Great Lakes and a cold front pushes into the Southeast. Gusty northwest winds will persist through Saturday will SCA gusts expected.

Winds will begin to diminish thereafter as high pressure becomes more centralized over the region into early next week. Sub-SCA winds are expected Sunday into Monday.

FIRE WEATHER. Dry weather will persist through Saturday and the RH values will be low each day (20s and 30s today, teens and 20s Friday, and 20s to lower 30s Saturday). Gusty northwest winds are expected during this time as well, with frequent gusts around 20 to 30 mph for most areas. As fuels continue to dry out over the next few days, the meteorological conditions may enhance the threat for the spread of wildfires, especially Friday afternoon and Saturday afternoon (when fuels will be driest).

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 6 PM EST Friday for ANZ530>543.

SYNOPSIS . MSS/BKF NEAR TERM . BKF SHORT TERM . MSS LONG TERM . CPB AVIATION . MSS/BKF/CPB MARINE . MSS/BKF/CPB FIRE WEATHER . BJL


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 5 mi57 min NNW 7 G 19 37°F 44°F1017.4 hPa
BSLM2 - Chesapeake Bay, MD 23 mi57 min NNE 7 37°F 1016 hPa20°F
APAM2 - 8575512 - Annapolis, MD 33 mi57 min WNW 14 G 18 37°F 42°F1015.8 hPa
TPLM2 - Thomas Point, MD 35 mi87 min WNW 18 G 21 38°F 40°F1016.9 hPa (+1.3)18°F
BLTM2 - 8574680 - Baltimore, MD 37 mi57 min N 15 G 23 35°F 41°F1016.1 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 37 mi57 min NW 19 G 25 36°F 1016.1 hPa
FSNM2 37 mi57 min NW 25 G 29 35°F 1015.4 hPa
CPVM2 38 mi57 min 37°F 22°F
NCDV2 42 mi57 min NNW 12 G 19 38°F 45°F1016.2 hPa
44062 - Gooses Reef, MD 44 mi45 min NW 19 G 23 38°F 40°F

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA6 mi35 minNNW 16 G 2710.00 miA Few Clouds36°F17°F46%1017.4 hPa
College Park Airport, MD10 mi32 minNW 12 G 1710.00 miFair34°F12°F40%1017.3 hPa
Camp Springs / Andrews Air Force Base, MD14 mi31 minNNW 18 G 2610.00 miPartly Cloudy and Breezy35°F17°F49%1017.1 hPa
Fort Belvoir, VA14 mi31 minNW 16 G 2010.00 miFair36°F14°F41%1017.6 hPa
Gaithersburg - Montgomery County Airport, MD17 mi31 minNNW 5 G 1510.00 miFair31°F16°F54%1018.8 hPa
Washington/Dulles International Airport, DC, VA19 mi35 minNNW 17 G 2510.00 miA Few Clouds33°F16°F49%1017.3 hPa
Fort Meade / Tipton, MD21 mi32 minNW 6 G 1010.00 miFair32°F19°F60%1017.6 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)
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Last 24hrS8S5NE4W5NW8N6NW11NW11NW10NW11N12
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1 day agoS8S9S7SW3CalmS4SW5SW4S6S3SE4W15
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N9N43CalmSE4S6S6S5SW3

Tide / Current Tables for Chain Bridge, one mile below, D.C.
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Chain Bridge
Click for Map
Thu -- 06:27 AM EST     -0.06 feet Low Tide
Thu -- 06:36 AM EST     Sunrise
Thu -- 09:52 AM EST     Moonset
Thu -- 12:11 PM EST     3.33 feet High Tide
Thu -- 06:04 PM EST     Sunset
Thu -- 07:26 PM EST     -0.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.92.72.11.40.80.2-0-00.41.32.333.33.22.721.30.70.3000.51.42.2

Tide / Current Tables for Reagan National Airport, Washington, D.C.
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Reagan National Airport
Click for Map
Thu -- 06:14 AM EST     -0.07 feet Low Tide
Thu -- 06:35 AM EST     Sunrise
Thu -- 09:52 AM EST     Moonset
Thu -- 11:57 AM EST     3.46 feet High Tide
Thu -- 06:04 PM EST     Sunset
Thu -- 07:13 PM EST     -0.02 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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32.721.30.60.2-0.100.61.62.63.33.53.22.61.91.20.60.2-00.10.71.62.4

Weather Map
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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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